@article{1103860584,
author = {Guerra, Francesco and Rosen, Lon and Simon, Barry},
title = {Correlation inequalities and the mass gap in $P(\phi)\_{2}$. III. Mass gap for a class of strongly coupled theories with nonzero external field},
journal = {Comm. Math. Phys.},
volume = {40},
number = {1},
year = {1975},
pages = { 19-32},
language = {en},
url = {http://dml.mathdoc.fr/item/1103860584}
}
Guerra, Francesco; Rosen, Lon; Simon, Barry. Correlation inequalities and the mass gap in $P(\phi)_{2}$. III. Mass gap for a class of strongly coupled theories with nonzero external field. Comm. Math. Phys., Tome 40 (1975) no. 1, pp. 19-32. http://gdmltest.u-ga.fr/item/1103860584/